Make Slug field compatible
Hi,
This PR refers to this previous issue : https://github.com/spatie/nova-translatable/issues/75
If a slug field is used with a non empty from property, package will overrides this property with "translated" conversion.

Note : a special case should be considered and not implemented yet : if the "from" field itself is not translatable.
It would also be nice to support the case when the "from" field is translatable, but slug is not and uses one of the languages.
@freekmurze any plans to support it?
Dear contributor,
because this pull request seems to be inactive for quite some time now, I've automatically closed it. If you feel this pull request deserves some attention from my human colleagues feel free to reopen it.